.\"	$NetBSD: curses_deleteln.3,v 1.4 2003/04/16 13:35:01 wiz Exp $
.\"
.\" Copyright (c) 2002
.\"	Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
.\"
.\" This code is donated to the NetBSD Foundation by the Author.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\"    notice, this list of conditions and the following disclaimer in the
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.\" 3. The name of the Author may not be used to endorse or promote
.\"    products derived from this software without specific prior written
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.Dd August 12, 2002
.Dt CURSES_DELETELN 3
.Os
.Sh NAME
.Nm curses_deleteln ,
.Nm deleteln ,
.Nm wdeleteln
.Nd curses delete single line routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.In curses.h
.Ft int
.Fn deleteln "void"
.Ft int
.Fn wdeleteln "WINDOW *win"
.Sh DESCRIPTION
These functions delete a single line from
.Dv stdscr
or from the specified window.
.Pp
The
.Fn deleteln
function deletes the screen line containing the cursor in the
.Dv stdscr .
The
.Fn wdeleteln
function is the same as the
.Fn deleteln
function, excepting that the line is deleted from the window specified by
.Fa win .
.Pp
All lines following the deleted line are moved up one line toward the cursor.
The last line of the window is cleared.
The cursor position is unchanged.
.Pp
If a scrolling region has been set with the
.Fn setscrreg
or
.Fn wsetscrreg
functions and the current cursor position is inside the scrolling region,
then only the lines from the current line to the bottom of the scrolling
region are moved up and the bottom line of the scrolling region cleared.
.Pp
The functions
.Fn deleteln
and
.Fn wdeleteln win
are equivalent to
.Fn winsdelln stdscr \-1
and
.Fn winsdelln win \-1
respectively.
.Sh RETURN VALUES
Functions returning pointers will return
.Dv NULL
if an error is detected.
The functions that return an int will return one of the following
values:
.Pp
.Bl -tag -width ERR -compact
.It Er OK
The function completed successfully.
.It Er ERR
An error occurred in the function.
.El
.Sh SEE ALSO
.Xr curses_insdelln 3 ,
.Xr curses_insertln 3 ,
.Xr curses_scroll 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of the
Single Unix Specification.
.Sh HISTORY
The Curses package appeared in
.Bx 4.0 .
